CN209311650U - A kind of low form battery protection metering circuit - Google Patents
A kind of low form battery protection metering circuit Download PDFInfo
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- CN209311650U CN209311650U CN201821620504.3U CN201821620504U CN209311650U CN 209311650 U CN209311650 U CN 209311650U CN 201821620504 U CN201821620504 U CN 201821620504U CN 209311650 U CN209311650 U CN 209311650U
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Abstract
The utility model belongs to battery applications technical field, discloses a kind of low form battery protection metering circuit.The utility model includes protection circuit, electric quantity metering circuit, the first lithium battery interface, the second lithium battery interface and charge and discharge electrical interface；Protection circuit includes the second metal-oxide-semiconductor for protecting chip U2, the first metal-oxide-semiconductor and drain electrode to be electrically connected with the drain electrode of the first metal-oxide-semiconductor；Institute's electric quantity metering circuit includes metering chip U1；The model BQ27541 of metering chip U1.The utility model makes the use temperature range of this circuit board reach -40 DEG C -80 DEG C; structure is simple; it being capable of effective protection lithium battery; extend the service life of lithium battery, it is easy to use, the electricity of the first lithium battery BT1 and the second lithium battery BT2 can be measured; convenient for the management of charging and discharging in lithium battery later period, maintenance or supervision; save the cost, practicability is high, and avoid causes electronic product can not normal use due to temperature.
Description
Technical field
The utility model belongs to battery applications technical field, and in particular to a kind of low form battery protection metering circuit.
Background technique
Battery plays very important effect as the indispensable energy source of electronic product, since China region is wide
Wealthy, most of electronic products needs to adapt to various environment.And the protection circuit plate of most popular lithium battery is being applied at present
In but there are problems that low temperature can not normal use, or even can stop working in the case where -20 DEG C, thus people be caused to use
It is extremely inconvenient, and after stopping working for some important outdoor military projects, people's livelihood equipment caused by loss be even more that can not estimate；Together
When, the charge-discharge circuit of existing lithium battery is more coarse, easily cause lithium battery to overcharge, over-discharge, overcurrent situations such as,
So that service life of lithium battery shortens.
Utility model content
In order to solve the above problems existing in the present technology, the utility model aim is to provide a kind of low form battery guarantor
Metering circuit is protected, solves the problems, such as that lithium battery protection circuit plate low temperature is not available, and can effectively extend making for lithium battery
With service life, practical convenient.
The technology employed by the present utility model is
A kind of low form battery protection metering circuit, including protection circuit, electric quantity metering circuit, the first lithium battery interface,
Second lithium battery interface and charge and discharge electrical interface；The anode and its cathode of the charge and discharge electrical interface pass through concatenated first diode
TVS1 and the second diode TVS2 electrical connection.
The protection circuit includes that protection chip U2, the first metal-oxide-semiconductor and drain electrode are electrically connected with the drain electrode of the first metal-oxide-semiconductor
Second metal-oxide-semiconductor；The power input that the positive B+ of the first lithium battery interface passes through first resistor R1 and protection chip U2
VDD electrical connection；The positive B+ of the first lithium battery interface is electrically connected with the anode of charge and discharge electrical interface；First MOS
The grid G 1 of pipe and the grid G 2 of the second metal-oxide-semiconductor are electrically connected with protection chip U2 respectively；The source S 1 of first metal-oxide-semiconductor with
The cathode B- of second lithium battery interface is electrically connected；The source S 2 of second metal-oxide-semiconductor is negative with the second lithium battery interface respectively
The cathode P- of pole B- and charge and discharge electrical interface electrical connection.
The electric quantity metering circuit includes metering chip U1；The model BQ27541 of the metering chip U1；It is described
Metering chip U1 the end VCC and its end SEG25 pass through thermistor NTC and be electrically connected with the end TS of metering chip U1；It is described
Thermistor NTC it is in parallel with the 9th capacitor C9；The cathode BM at the end BAT of the metering chip U1 and the first lithium battery interface
End and the electrical connection of the positive end BM of the second lithium battery；The end BAT, the end VCC, the end VSS and its end PWPD of the metering chip U1
It is grounded；The end HDQ of the metering chip U1 is electrically connected with the 8th resistance R8 that one end is grounded；The metering chip U1's
The end SCL is successively electrically connected with eleventh resistor R11 and thirteenth resistor R13；The end SDA of the metering chip U1 is successively with
12 resistance R12 and the 14th resistance R14 electrical connection；The eleventh resistor R11 and the junction thirteenth resistor R13 and ground
Between be connected with the first voltage-stabiliser tube ZD1 and the 16th resistance R16 being arranged in parallel；The twelfth resistor R12 and the 14th
The the second voltage-stabiliser tube ZD2 and the 15th resistance R15 being arranged in parallel are connected between the junction and ground of resistance R14.
Preferably, the end HDQ of the metering chip U1 passes through the cathode of the 7th resistance R7 and the first lithium battery interface
The end BM and the electrical connection of the positive end BM of the second lithium battery；The output end of the thirteenth resistor R13 by the 9th resistance R9 with
The end cathode BM of first lithium battery interface and the positive end the BM electrical connection of the second lithium battery；The 14th resistance R14's is defeated
Outlet is electrically connected by the 8th resistance R8 with the positive end BM of the end cathode BM of the first lithium battery interface and the second lithium battery.
Preferably, the end SRP of the metering chip U1 pass through respectively the 17th resistance R17 and with the 17th resistance
11st capacitor C11 of R17 parallel connection is grounded；The end SRN of the metering chip U1 passes through the 18th resistance R18 and respectively with
12nd capacitor C12 of 18 resistance R18 parallel connections is grounded；The end SRP of the metering chip U1 passes through the tenth capacitor C10 and meter
Measure the end the SRN electrical connection of chip U1.
Preferably, the end BAT of the metering chip U1 is grounded by the 7th capacitor C7；The metering chip U1's
The end VCC is grounded by the 8th capacitor C8.
Preferably, the protection circuit passes through bleeder circuit and electric quantity metering circuit connection；The bleeder circuit
Including dividing chip U3；The power input VIN of the described partial pressure chip U3 respectively with the positive B+ of the first lithium battery interface and
One end of 5th capacitor C5 is electrically connected；The power output end VOUT of the partial pressure chip U3 is grounded by the 6th capacitor C6；Institute
The power output end VOUT for stating partial pressure chip U3 is electrically connected by the 4th resistance R4 with the positive P+ of charge and discharge electrical interface；The meter
The end REGIN for measuring chip U1 is electrically connected with the power output end VOUT of partial pressure chip U3.
Preferably, the model HT7150-2 of the partial pressure chip U3.
Preferably, the model R5460N214AF of the protection chip U2；The end Dout of the protection chip U2
It is electrically connected with the grid G 1 of the first metal-oxide-semiconductor；The end Cout of the protection chip U2 is electrically connected with the grid G 2 of the second metal-oxide-semiconductor.
Preferably, the end cathode BM of the first lithium battery interface and the positive end BM of the second lithium battery pass through
Two resistance R2 are electrically connected with the end VC of protection chip U2；The end VSS of the protection chip U2 pass sequentially through first capacitor C1 and
The end VSS that first resistor R1 is electrically connected the protection chip U2 with the positive B+ of the first lithium battery interface passes sequentially through the second electricity
Hold C2 and second resistance R2 to be electrically connected with the positive end BM of the end cathode BM of the first lithium battery interface and the second lithium battery.
Preferably, the end V- of the protection chip U2 passes sequentially through third capacitor C3 and steady resistance RS1 and second
The cathode B- of lithium battery interface is electrically connected；The source S 2 of second metal-oxide-semiconductor is born by steady resistance RS1 and the second lithium battery interface
Pole B- electrical connection.
Preferably, first metal-oxide-semiconductor and the second metal-oxide-semiconductor is packaged in the metal-oxide-semiconductor chip U4 of model AO8810
In.
The utility model has the following beneficial effects:
By being used cooperatively for three circuits, so that the use temperature range of this circuit board reaches -40 DEG C -80 DEG C；Type
Number for R5460 protect the setting of chip U2 ensure protection board it is more consistent than lithium battery not will cause at use temperature accidentally protection,
And entire protection circuit structure is simple, can effective protection lithium battery, extend the service life of lithium battery, it is easy to use；Model
The electricity for making it possible to measure the first lithium battery BT1 and the second lithium battery BT2 for the setting of BQ27541 metering chip U1, is convenient for
Management of charging and discharging, maintenance or the supervision in lithium battery later period realize and can measure two lithium batteries with single electric quantity metering circuit
The function of electricity, save the cost, practicability are high；The minimum of the utility model has reached present earth lowest limit temperature using temperature
Degree, therefore can come into operation in all regions, avoid causes electronic product can not normal use due to temperature.
Detailed description of the invention
Fig. 1 is the structural block diagram of the utility model.
Fig. 2 is the circuit diagram that circuit is protected in the utility model.
Fig. 3 is the circuit diagram of electric quantity metering circuit in the utility model.
Fig. 4 is the circuit diagram of bleeder circuit in the utility model.
Specific embodiment
With reference to the accompanying drawing and specific embodiment is further elaborated the utility model.
As shown in Figure 1, the present embodiment provides a kind of low form battery protection metering circuit, including protection circuit, voltameter
Measure circuit, the first lithium battery interface, the second lithium battery interface and charge and discharge electrical interface；The anode and its cathode of charge and discharge electrical interface pass through
Concatenated first diode TVS1 and the second diode TVS2 electrical connection, first diode TVS1 and the second diode TVS2 reversal connection
It is equivalent to a bidirectional trigger diode, to protect the component in circuit and load.
As shown in Fig. 2, protection circuit includes that chip U2, the first metal-oxide-semiconductor and drain electrode and the drain electrode of the first metal-oxide-semiconductor is protected to be electrically connected
The second metal-oxide-semiconductor connect；The power input VDD that the positive B+ of first lithium battery interface passes through first resistor R1 and protection chip U2
Electrical connection；The positive B+ of first lithium battery interface is electrically connected with the anode of charge and discharge electrical interface；The grid G 1 of first metal-oxide-semiconductor and second
The grid G 2 of metal-oxide-semiconductor is electrically connected with protection chip U2 respectively；The cathode B- of the source S 1 of first metal-oxide-semiconductor and the second lithium battery interface
Electrical connection；Cathode P- of the source S 2 of second metal-oxide-semiconductor respectively with the cathode B- of the second lithium battery interface and charge and discharge electrical interface is electrically connected
It connects.First metal-oxide-semiconductor and the second metal-oxide-semiconductor play on-off action in the protection circuit, and protection chip U2's overcharges electro-detection output pin
The end DO and its over-discharge electro-detection end output pin CO output square wave control control the conducting of the first metal-oxide-semiconductor and the second metal-oxide-semiconductor and break
It opens, and then controls the conducting and shutdown of charge circuit and discharge loop, so that protection circuit realizes that circuit is protected with overcharge
Shield, over, overcurrent protection and short-circuit protection function.
In the present embodiment, the model R5460N214AF of chip U2 is protected；Protect the end Dout and the first MOS of chip U2
The grid G 1 of pipe is electrically connected；The end Cout of protection chip U2 is electrically connected with the grid G 2 of the second metal-oxide-semiconductor.
In the present embodiment, the end cathode BM of the first lithium battery interface and the positive end BM of the second lithium battery pass through the second electricity
Resistance R2 is electrically connected with the end VC of chip U2 is protected；The end VSS of protection chip U2 passes sequentially through first capacitor C1 and first resistor R1
The end VSS that protection chip U2 is electrically connected with the positive B+ of the first lithium battery interface passes sequentially through the second capacitor C2 and second resistance R2
It is electrically connected with the positive end BM of the end cathode BM of the first lithium battery interface and the second lithium battery.
In the present embodiment, the end V- of protection chip U2 passes sequentially through third capacitor C3 and steady resistance RS1 and the second lithium electricity
The cathode B- of pond interface is electrically connected；The source S 2 of second metal-oxide-semiconductor passes through the cathode B- of steady resistance RS1 and the second lithium battery interface
Electrical connection；Steady resistance RS1, which plays a part of to provide in this circuit, stablizes quiescent biasing.
In the present embodiment, the first metal-oxide-semiconductor and the second metal-oxide-semiconductor are packaged in the metal-oxide-semiconductor chip U4 of model AO8810.
As shown in figure 3, electric quantity metering circuit includes metering chip U1；The model BQ27541 of metering chip U1；Metering core
The end VCC and its end SEG25 of piece U1 passes through thermistor NTC and is electrically connected with the end TS of metering chip U1；Thermistor NTC with
9th capacitor C9 is in parallel；The end BAT of metering chip U1 and the end cathode BM of the first lithium battery interface and the anode of the second lithium battery
The electrical connection of the end BM；The end BAT, the end VCC, the end VSS and its end PWPD of metering chip U1 is grounded；The end HDQ of metering chip U1 with
The 8th resistance R8 electrical connection of one end ground connection；The end SCL of metering chip U1 successively with eleventh resistor R11 and thirteenth resistor
R13 electrical connection；The end SDA of metering chip U1 is successively electrically connected with twelfth resistor R12 and the 14th resistance R14；11st electricity
The the first voltage-stabiliser tube ZD1 and the 16th resistance being arranged in parallel are connected between resistance R11 and the junction thirteenth resistor R13 and ground
R16；The second voltage-stabiliser tube ZD2 being arranged in parallel is connected between twelfth resistor R12 and the junction and ground of the 14th resistance R14
And the 15th resistance R15.The end SDA of metering chip U1 and its end SCL connect bus, are used for sending and receiving data.
In the present embodiment, the end HDQ of metering chip U1 passes through the end cathode BM of the 7th resistance R7 and the first lithium battery interface
And second lithium battery the positive end BM electrical connection；The output end of thirteenth resistor R13 passes through the 9th resistance R9 and the first lithium battery
The end cathode BM of interface and the positive end the BM electrical connection of the second lithium battery；The output end of 14th resistance R14 passes through the 8th resistance
R8 is electrically connected with the positive end BM of the end cathode BM of the first lithium battery interface and the second lithium battery.
In the present embodiment, the end SRP of metering chip U1 pass through respectively the 17th resistance R17 and with the 17th resistance R17 simultaneously
The 11st capacitor C11 ground connection of connection；The end SRN of metering chip U1 pass through respectively the 18th resistance R18 and with the 18th resistance R18
12nd capacitor C12 ground connection in parallel；The end the SRN electricity that the end SRP of metering chip U1 passes through the tenth capacitor C10 and metering chip U1
Connection.
In the present embodiment, the end BAT of metering chip U1 is grounded by the 7th capacitor C7；The end VCC of metering chip U1 passes through
8th capacitor C8 ground connection.
In the present embodiment, protection circuit passes through bleeder circuit and electric quantity metering circuit connection；As shown in figure 4, bleeder circuit
Including dividing chip U3；The power input VIN for dividing chip U3 is electric with the positive B+ of the first lithium battery interface and the 5th respectively
Hold one end electrical connection of C5, the other end ground connection of the 5th capacitor C5；The power output end VOUT for dividing chip U3 passes through the 6th electricity
Hold C6 ground connection；The power output end VOUT of the partial pressure chip U3 is electrically connected by the positive P+ of the 4th resistance R4 and charge and discharge electrical interface
It connects；The end REGIN of metering chip U1 is electrically connected with the power output end VOUT of partial pressure chip U3；After being connected by bleeder circuit
The first lithium battery BT1 and the total voltage of the second lithium battery BT2 be reduced to the need for generally being allowed to meet metering chip U1 normal work
It asks, the total voltage after finally measuring the first lithium battery BT1 and the second lithium battery BT2 series connection, and then realizes single metering chip
U1 is applied to the function of two lithium batteries.In the present embodiment, the model HT7150-2 of chip U3 is divided.
The utility model is not limited to above-mentioned optional embodiment, anyone can obtain under the enlightenment of the utility model
Other various forms of products, however, making any variation in its shape or structure, all the utility model rights that falls into are wanted
The technical solution in confining spectrum is sought, is all fallen within the protection scope of the utility model.
Claims (10)
1. a kind of low form battery protection metering circuit, it is characterised in that: including protecting circuit, electric quantity metering circuit, the first lithium
Battery interface, the second lithium battery interface and charge and discharge electrical interface；The anode and its cathode of the charge and discharge electrical interface pass through concatenated
First diode TVS1 and the second diode TVS2 electrical connection；
The protection circuit includes protect chip U2, the first metal-oxide-semiconductor and drain electrode to be electrically connected with the drain electrode of the first metal-oxide-semiconductor second
Metal-oxide-semiconductor；The positive B+ of the first lithium battery interface is by first resistor R1 and protects the power input VDD of chip U2 electric
Connection；The positive B+ of the first lithium battery interface is electrically connected with the anode of charge and discharge electrical interface；The grid of first metal-oxide-semiconductor
The grid G 2 of pole G1 and the second metal-oxide-semiconductor is electrically connected with protection chip U2 respectively；The source S 1 and the second lithium of first metal-oxide-semiconductor
The cathode B- of battery interface is electrically connected；The source S 2 of second metal-oxide-semiconductor respectively with the cathode B- of the second lithium battery interface and
The cathode P- of charge and discharge electrical interface is electrically connected；
The electric quantity metering circuit includes metering chip U1；The model BQ27541 of the metering chip U1；The meter
The end VCC and its end SEG25 for measuring chip U1 pass through thermistor NTC and are electrically connected with the end TS of metering chip U1；The heat
Quick resistance NTC is in parallel with the 9th capacitor C9；The end cathode BM of the end BAT of the metering chip U1 and the first lithium battery interface and
The positive end BM of second lithium battery is electrically connected；The end BAT, the end VCC, the end VSS and its end PWPD of the metering chip U1 connects
Ground；The end HDQ of the metering chip U1 is electrically connected with the 8th resistance R8 that one end is grounded；The SCL of the metering chip U1
End is successively electrically connected with eleventh resistor R11 and thirteenth resistor R13；The end SDA of the metering chip U1 is successively with the tenth
Two resistance R12 and the 14th resistance R14 electrical connection；The eleventh resistor R11's and the junction thirteenth resistor R13 and ground
Between be connected with the first voltage-stabiliser tube ZD1 and the 16th resistance R16 being arranged in parallel；The electricity of the twelfth resistor R12 and the 14th
It hinders and is connected with the second voltage-stabiliser tube ZD2 and the 15th resistance R15 being arranged in parallel between the junction and ground of R14.
2. low form battery protection metering circuit according to claim 1, it is characterised in that: the metering chip U1's
The end HDQ is electrically connected by the 7th resistance R7 with the positive end BM of the end cathode BM of the first lithium battery interface and the second lithium battery；Institute
The output end of the thirteenth resistor R13 stated passes through the end cathode BM and the second lithium battery of the 9th resistance R9 and the first lithium battery interface
The positive end BM electrical connection；The output end of the 14th resistance R14 passes through the 8th resistance R8 and the first lithium battery interface
The end cathode BM and the electrical connection of the positive end BM of the second lithium battery.
3. low form battery protection metering circuit according to claim 2, it is characterised in that: the metering chip U1's
The end SRP passes through the 17th resistance R17 and the ten one capacitor C11 ground connection in parallel with the 17th resistance R17 respectively；The metering
The end SRN of chip U1 passes through the 18th resistance R18 and the ten two capacitor C12 ground connection in parallel with the 18th resistance R18 respectively；Institute
The end SRP of the metering chip U1 stated is electrically connected by the tenth capacitor C10 with the end SRN of metering chip U1.
4. low form battery protection metering circuit according to claim 3, it is characterised in that: the metering chip U1's
The end BAT is grounded by the 7th capacitor C7；The end VCC of the metering chip U1 is grounded by the 8th capacitor C8.
5. low form battery protection metering circuit according to any one of claims 1 to 4, it is characterised in that: the protection
Circuit passes through bleeder circuit and electric quantity metering circuit connection；The bleeder circuit includes partial pressure chip U3；The partial pressure core
The power input VIN of piece U3 is electrically connected with one end of the positive B+ of the first lithium battery interface and the 5th capacitor C5 respectively；It is described
Partial pressure chip U3 power output end VOUT by the 6th capacitor C6 ground connection；The power output end VOUT of the partial pressure chip U3
It is electrically connected by the 4th resistance R4 with the positive P+ of charge and discharge electrical interface；The end REGIN of the metering chip U1 and partial pressure chip
The power output end VOUT of U3 is electrically connected.
6. low form battery protection metering circuit according to claim 5, it is characterised in that: the partial pressure chip U3's
Model HT7150-2.
7. low form battery protection metering circuit according to claim 5, it is characterised in that: the protection chip U2's
Model R5460N214AF；The end Dout of the protection chip U2 is electrically connected with the grid G 1 of the first metal-oxide-semiconductor；The guarantor
The end Cout of shield chip U2 is electrically connected with the grid G 2 of the second metal-oxide-semiconductor.
8. low form battery protection metering circuit according to claim 7, it is characterised in that: first lithium battery connects
The end cathode BM of mouth and the positive end BM of the second lithium battery pass through second resistance R2 and are electrically connected with the end VC of chip U2 is protected；Institute
The end VSS of the protection chip U2 stated passes sequentially through the positive B+ electricity of first capacitor C1 and first resistor R1 and the first lithium battery interface
The end VSS of the connection protection chip U2 passes sequentially through bearing for the second capacitor C2 and second resistance R2 and the first lithium battery interface
The pole end BM and the electrical connection of the positive end BM of the second lithium battery.
9. low form battery protection metering circuit according to claim 8, it is characterised in that: the protection chip U2's
The end V- passes sequentially through third capacitor C3 and steady resistance RS1 and is electrically connected with the cathode B- of the second lithium battery interface；Second metal-oxide-semiconductor
Source S 2 is electrically connected by steady resistance RS1 with the cathode B- of the second lithium battery interface.
10. low form battery protection metering circuit according to claim 1, it is characterised in that: first metal-oxide-semiconductor and
Second metal-oxide-semiconductor is packaged in the metal-oxide-semiconductor chip U4 of model AO8810.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821620504.3U CN209311650U (en) | 2018-09-30 | 2018-09-30 | A kind of low form battery protection metering circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821620504.3U CN209311650U (en) | 2018-09-30 | 2018-09-30 | A kind of low form battery protection metering circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209311650U true CN209311650U (en) | 2019-08-27 |
Family
ID=67670583
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821620504.3U Active CN209311650U (en) | 2018-09-30 | 2018-09-30 | A kind of low form battery protection metering circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209311650U (en) |
-
2018
- 2018-09-30 CN CN201821620504.3U patent/CN209311650U/en active Active
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